| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // A specialized buffer for interfacing with audio / video decoders. |
| // |
| // Specifically ensures that data is aligned and padded as necessary by the |
| // underlying decoding framework. On desktop platforms this means memory is |
| // allocated using FFmpeg with particular alignment and padding requirements. |
| // |
| // Also includes decoder specific functionality for decryption. |
| |
| #ifndef MEDIA_BASE_DECODER_BUFFER_H_ |
| #define MEDIA_BASE_DECODER_BUFFER_H_ |
| |
| #include "base/memory/scoped_ptr.h" |
| #include "media/base/buffers.h" |
| #include "media/base/decrypt_config.h" |
| |
| namespace media { |
| |
| class MEDIA_EXPORT DecoderBuffer : public Buffer { |
| public: |
| // Allocates buffer of size |buffer_size| >= 0. Buffer will be padded and |
| // aligned as necessary. |
| explicit DecoderBuffer(int buffer_size); |
| |
| // Create a DecoderBuffer whose |data_| is copied from |data|. Buffer will be |
| // padded and aligned as necessary. |data| must not be NULL and |size| >= 0. |
| static scoped_refptr<DecoderBuffer> CopyFrom(const uint8* data, int size); |
| |
| // Create a DecoderBuffer indicating we've reached end of stream. GetData() |
| // and GetWritableData() will return NULL and GetDataSize() will return 0. |
| static scoped_refptr<DecoderBuffer> CreateEOSBuffer(); |
| |
| // Buffer implementation. |
| virtual const uint8* GetData() const OVERRIDE; |
| virtual int GetDataSize() const OVERRIDE; |
| |
| // Returns a read-write pointer to the buffer data. |
| virtual uint8* GetWritableData(); |
| |
| virtual const DecryptConfig* GetDecryptConfig() const; |
| virtual void SetDecryptConfig(scoped_ptr<DecryptConfig> decrypt_config); |
| |
| protected: |
| // Allocates a buffer of size |size| >= 0 and copies |data| into it. Buffer |
| // will be padded and aligned as necessary. If |data| is NULL then |data_| is |
| // set to NULL and |buffer_size_| to 0. |
| DecoderBuffer(const uint8* data, int size); |
| virtual ~DecoderBuffer(); |
| |
| private: |
| int buffer_size_; |
| uint8* data_; |
| scoped_ptr<DecryptConfig> decrypt_config_; |
| |
| // Constructor helper method for memory allocations. |
| void Initialize(); |
| |
| DISALLOW_COPY_AND_ASSIGN(DecoderBuffer); |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_BASE_DECODER_BUFFER_H_ |